[1] It was the inaugural election for the unitary authority, which was created one month before in April 2021, after the merger of the four existing non-metropolitan districts of Corby, East Northamptonshire, Kettering, and Wellingborough.

[3] [4] A by-election was held to fill the seat vacated by Cllr Annabel de Capell Brooke.

[5] A by-election was held on 2 February 2023 due to the death of Cllr Kevin Thurland.

[6] a by-election was held on 23 March 2024 due to the death of Cllr David Jenny.

[7] A by-election was held on 4 April 2025 due to the death of Cllr Mike Tebbutt.